1) Make sure not to read uninitialized data in unique index code
      harmless (atleast before dynattr)
  2) Dont update p_latest_trans_gci
      for dirty unique index lookup
  


storage/ndb/src/kernel/blocks/dbtup/DbtupTrigger.cpp:
  Make sure not to read uninitialized data in unique index code
    harmless (atleast before dynattr)
storage/ndb/src/ndbapi/NdbTransaction.cpp:
  Dont update p_latest_trans_gci
    for dirty unique index lookup